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TRANSFORMERS
3.24 CHAPTER THREE
FIGURE 3.20 A three-phase transformer bank composed of independent transformers.
FIGURE 3.21 A three-phase transformer wound on a single three-legged core.
windings on a common core (Fig. 3.21). The second alternative is preferred because the
transformer is cheaper, smaller, lighter, and slightly more efficient.
Three-Phase Transformer Connections
The primary and secondary phases of any three-phase transformer are independently con-
nected as a wye (Y) or delta ( ). The possible connections of a three-phase transformer are
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